Method of inhibiting the clouding of liquid soap during storage in glass containers



Patented Sept. 9, 1941 METHOD OF INHIBITING THE CLOUDNG OF LIQUID SOAP DURING STORAGE m GLASS CON TAIN EBS Barry L. Roschen, Maywood, 11L, assignor to Industrlai Patents Corporatiomflhicago, BL, a

corporation of Delaware No Drawing. Application December 24, 1938, Serial No. 247,643

Claims.

This invention relates to liquid soap preparations.

Liquid soap preparations, such as shampoos, when stored and held in glass containers become cloudy after standing for several months. This is generally true regardless of the soap composition and concentration and in spite of the fact that care is used in preparing a clear liquid soap before transferring the soap into the storage containers or bottles. The cloud is readily dispersed in the liquid by a slight movement or the liquid and imparts to the liquid soap a cloudy appearance.

One of the objects of this invention is to in- I hibit the formation of a precipitate in liquid soap preparations which are to be stored in glass containers.

The present invention contemplates theadditlon of a small amount of a hexametaphosphate to the liquid soap preparation.

Liquid soaps generally consist of an aqueous solution or a dilute alcohol-aqueous solution of a potassium salt oi the fatty acids derived from cocoanut oil. Sodium salts of oleic acid or similar liquid acids are also employed in the preparation 01 liquid soaps. These liquid soap Preparations generally contain from 15 per cent to 30 per cent soap.

In the present invention, hexametaphospha'te is employed to inhibit the formation of the cloudy precipitate in clear liquid soap stored in glass containers. Other materials such as sulphonated higher alcohols,' rosin potash soap and'triethanolamine soap are unsatisfactory for the purposes of my invention.

In practicing my invention a solution of soap soap. The liquid soap preparation is then held for several days and the suspended solid matter filtered to form a clear liquid soap. A small amount of a water soluble hexametaphosphate,

for example, sodium hexametaphosphate is then 'dissolved in the liquid soap preparation. the

by dissolving soap in water and holding the solu-' tion at a temperature of from 40 degrees to 45 degrees F. for two days. The solution was then filtered to remove all suspended solid matter and to thereby clarify the solution. The solution prepared contained approximately 23 per cent soap. Samples were then prepared by dissolving in portions of the clear soap solution, 1 per cent and 2 per cent sodium hexametaphosphate, the amount of hexametaphosphatebelng based upon the total soap content of the solution. Portions oi the soap preparation containing soap solution only, soap solution containing 1 per cent sodium hexametaphosphate and soap solution containing 2 per cent of sodium hexametaphosphate were placed in common glass containers and stored for a period or thirty-three (33) weeks, and the samples examined periodically. The commercial containers employed in the tests included both white and green glass. At the end 0! thirty-three (33) weeks all of the control samples were very cloudy. These samples contained no sodium hexametaphosph'ate. The samples containing the inhibitor were slightly cloudy at the most, most of them being practically clear.

2 1 16 weeks as weeks Test No. 1:

Control (no hsxameta- Clean.-- Clean..- Very cloudy.

g ph ic). l hexametaphosphaie. ..do .-.do Very sl. cloudy. 2% hexametaphosphete. d d Do.

Test No. 2: Control Very cloudy.

17 hexametaphosphatc Practically clear.

a hexametaphosphate. Do. Test No. 3:

Con Verg cloudy. 1 haxametaphosphute. Slig tly cloudy. 35 hexametapliosphata d Practically clear.

Test 0. 4:

Control Very cloudy. 21% hexametaphosphate. d Slightly cloudy.

a liexametaphosphste. d do Practically clear. Test No. 5:

Control do do Verg cloudy. 40 l lieuametaplmsplmtcv ..do o Slig tly cloudy.

n hemmetaphcsphate. do 0... Practically clear. Test 0. 6:

Contr l -do do Cloudy. hexametaphcsphaie. ..do -..do---.. Practically clear.

herametaphosphato. ..-do... -.do..... Do.

I claim:

metal hexametaphosphate based on the totalsoap content or the solution 2', The method or inhibiting the clouding of iquid potassium soaps during storage in glass containers which comprises removing the insoluble calcium and magnesium compounds by filtering'the soap solution, and thereafter adding to the soap solution about 1% to 2% of a water soluble alkali metal hexametaphosphate based on the total soap content of the solution.

3. The method of inhibiting clouding of liquid potassium cocoanut oil soap during storage of the soap in glass containers which comprises re- 1 moving the insoluble calcium and magnesium liquid potassium soaps during storage in glass containers which comprises removing the insoluble calcium and magnesium compounds by flltering the soap solution, and thereafter adding to liquid potassium soaps during storage in glass containers which comprises permitting the solution to stand at a temperature 01' about 40 to 45 F., removing the insoluble calcium and magnesium compounds by filtering, and adding to the clarified soap solution about 1% to 2% of sodium hexametaphosphate based on the total soap content of the solution.

HARRY L. ROSCHEN. 

